At subtraction of two numbers Zhenya accidentally attributed excess zero at the end of reduced and instead of 32 received 644. To what number Zhenya accidentally did attribute 0? Write down the decision and the answer! Sraoochno!

228

We will designate a minuend for x, and a subtrahend for y isostavy the system of the equations. Let's notice that Zhenya attributed to reduced 0, etoznachit that the minuend was increased na10:

= 32

10x – = 644

we will express

x-y to y from the first equation Now x and we will substitute in the second to calculate y:

x = 32 + y ⇒ 10 ⋅ (32 + y) – y = 644,320 + 10y – y = 644

to

9y = 644 – 320

to

9y = 324

to

y = 36

Then x is equal to

:

 x = 32 + 36 = 68

ANSWER: 68

364
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